noun
out-of-service train; deadhead train
Refers to a train (or by extension a bus) being moved without passengers, typically to a depot or another station. The term is most natural for rail vehicles; for buses, 回送バス is also common.
ホームに回送電車が入ってきた。
An out-of-service train pulled into the platform.
回送電車は乗客を乗せずに
The deadhead train returns to the depot without passengers.